Show that sinB.cosC+sinC.cosB=sinA ?
1 Answer
Jan 21, 2018
We have ,
#color(red)(A+B+C=pi#
#sinB cdot cosC +sinC cdot cosB#
#=sin(B+C)#
#=sin(pi-A)#
#=sinA#
We have ,
#color(red)(A+B+C=pi#
#sinB cdot cosC +sinC cdot cosB#
#=sin(B+C)#
#=sin(pi-A)#
#=sinA#